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annotationS. 28. Thinks Gärtner's reversions due to parent pollen: Naudin's results point to opposite extreme. Does not Gärtner say that cultivated vars. revert more than wild species? Does this not account for difference between Naudin & Wichura?

annotationp. 83 Explains sterility of hybrids by combined organization being ill-fitted for conditions. I give this view p. 288 / 3rd ed. of Origin; but contradicted if offspring from homomorphic unions are sterile.